Compare Mowers
List prices are the manufacturer’s published figures, re-checked daily; they exclude tax, freight and dealer setup.
A side-by-side reference of each model's stated specifications. MowerFacts doesn’t give opinions: where a published, spec-derived rule can separate machines we mark a Data Pick and show the rule; here, read the values and decide what fits your needs.
Best suited for
What each model is built for, from its duty class and key specs. This is a neutral reference — MowerFacts does not rank one model above another.
- Grasshopper 329 — commercial: daily paid use and high acreage; 52-inch deck; gas powered
- Gravely PRO-TURN 552 KAWASAKI FX921 — commercial: daily paid use and high acreage; 52-inch deck; gas powered
What’s different? The 5 differences that matter most, from the published figures.
- 329 uses a Kubota engine; PRO-TURN 552 KAWASAKI FX921 uses a Kawasaki® engine. The engine maker builds the engine; the mower maker chooses the model, rating and fit, so the badge alone does not settle output or longevity.
- 329 has a published top speed of 10 mph; PRO-TURN 552 KAWASAKI FX921 has a published top speed of 15 mph, a 5 mph difference. Top speed is the maker's maximum in transport. Mowing speed is lower and depends on grass, terrain and the deck.
- 329 lists at $16,495; PRO-TURN 552 KAWASAKI FX921 lists at $14,999, a $1,496 difference. List price is the maker's own figure before tax, freight and dealer setup. Dealers set the final price.
- 329 weighs 1,310 lbs (594.2 kg); PRO-TURN 552 KAWASAKI FX921 weighs 1,447 lbs (656.4 kg), a 137 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What 329's weight means for a trailer ›
- 329 holds 12 gal (45.4 L) of fuel; PRO-TURN 552 KAWASAKI FX921 holds 12.5 gal (47.3 L) of fuel, a 0.5 gal difference. Tank size bounds how long a machine runs between stops. Consumption varies with engine, load and speed, so hours per tank are not fixed.
1 more difference, calculated figures and what isn’t comparable
Other verified differences
- 329 has a 58.7 ci (962 cc) engine; PRO-TURN 552 KAWASAKI FX921 has a 61 ci (999 cc) engine, a 2.3 ci difference.
Calculated by MowerFacts
- 329 works out to 4.2 acres/hour; PRO-TURN 552 KAWASAKI FX921 works out to 6.3 acres/hour, a 2.1 acres/hour difference. Calculated by MowerFacts from deck width and the published top speed at 80% efficiency; it is not a manufacturer figure, and real mowing is slower.
Not comparable
- Engine Power: not published for 329.
- Voltage: not published for 329.
- Transmission: not published for PRO-TURN 552 KAWASAKI FX921.
- Deck Material: not published for 329.
- Deck Construction: not published for PRO-TURN 552 KAWASAKI FX921.
- Drive System: not published for 329.
- Cut height range: not published for 329.
Verified means each manufacturer publishes the figure. A bigger number is only a bigger number; nothing here says which machine is better. The full specification table is below.
Which is faster on your property? › Measure your lawn once and MowerFacts times all 2 against it.
| Spec | 329 Grasshopper · Zero-Turn |
PRO-TURN 552 KAWASAKI FX921 Gravely · Zero-Turn |
|---|---|---|
| List price | $16,495 | $14,999 |
| Engine | ||
| Power Source | gas | gas |
| Displacement | 58.7 ci (962 cc) | 61 ci (999 cc) |
| Engine Power | — | 31 hp |
| Engine Make | Kubota | Kawasaki® |
| Engine Model | — | FX921V |
| Fuel Type | Gasoline | gas |
| Cylinders | 3 | — |
| Electrical | ||
| Voltage | — | 12 V |
| Deck | ||
| Cutting Width | 52 in (1321 mm) | 52 in (1321 mm) |
| Min Cut Height | — | 1 in (25 mm) |
| Max Cut Height | — | 5.5 in (140 mm) |
| Deck Material | — | Fabricated |
| Deck Construction | DuraMax double-layered 10-gauge plus 7-gauge robotic-welded steel | — |
| Deck Gauge | 10 | 7 |
| Drive | ||
| Transmission | G2 Hydrostatic Transmission | — |
| Ground Speed | 10 mph | 15 mph |
| Reverse Speed | 6 mph | 6 mph |
| Drive System | — | Parker® HTJ |
| Dimensions | ||
| Weight | 1310 lbs (594.2 kg) | 1447 lbs (656.4 kg) |
| Fuel Capacity | 12 gal (45.4 L) | 12.5 gal (47.3 L) |
Where these models differ, explained
329: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — grasshoppermower.com.
PRO-TURN 552 KAWASAKI FX921: Specs verified against the retailer listing on Jun 6, 2026 — bobcatofatlanta.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.